Our story begins as Vox Machina, the heroes of Emon, arrive at the cavernous underground city of Kraghammer. After wiping out a grave threat to Emon's emperor, Sovereign Uriel Tal'Dorei III, the band of adventurers has been sent on a journey by Arcanist, Allura Vysoren to find Lady Kima of Vord, a Halfling Paladin of Bahamut, who was drawn to Kraghammer upon learning of a great evil resting beneath it. The party get their bearings in the sprawling, dwarven city, meet a few of its more colorful denizens, and learn that the dwarves have been dealing with unnatural creatures spilling out of the mines in recent months. The mine's overseer, Nostoc Greyspine, barely finishes explaining their troubles, when a pack of goblins and ogres come spilling out of the mine's entrance, pursued by something far worse.